Ember Super Rentals Tutorial 3.15 - Working with data

I was following the ember Super Rental 3.15 tutorial, when I got to the working with data section, I updated the route index file with model hooks, the page stopped working. Also I am finding ember tutorials to be incomplete.

error says property of map is undefined code in routes index.js file:

import Route from '@ember/routing/route';

const COMMUNITY_CATEGORIES = [
  'Condo',
  'Townhouse',
  'Apartment'
];

export default class IndexRoute extends Route {
  async model() {
    let response = await fetch('/api/rentals.json');
    let { data } = await response.json();

    return data.map(model => {
      let { attributes } = model;
      let type;

      if (COMMUNITY_CATEGORIES.includes(attributes.category)) {
        type = 'Community';
      } else {
        type = 'Standalone';
      }

      return { type, ...attributes };
    });
  }
}

image if error message:

Solution

Your problem is that fetch('/api/rentals.json'); does not return the correct data. And so when you do let { data } = await response.json(); then data will be undefined and you can not do undefined.map.

So the code you posted is correct. The problem is somewhere else. You can check:

did you correctly add the rentals.json file? If you open http://localhost:4200/api/rentals.json do you see the data? So have you done this?
I see some error from mirage. The super-rentals tutorial does not use mirage. I can see this here (sidenote: that git repo is automatically created from the guides, so its always up to date). So this could be your problem. Depending how you configure mirage it will basically mock all your ajax requests. This means that fetch(... will no longer work then expected, mirage assumes you always want to use mocked data and you did not configure mirage correctly. You can try to remove mirage from your package.json, rerun npm install, restart the ember server and try it again.